Production of photographic films in natural colors



Jan. 9, 1923.

R. WELLESLEY.

PRODUCTION OF PHOTOGRAEHIC FILMS IN NATURAL COLORS.

FILED JUNE 29,1920.

Patented Ian. "9, 1923.

warren at RICHARD WELLESLEY, or GOODMAYES, ENGLAND.

PRODUCTION OF PHOTOGBAPHIC FILMS IN NATURAL COLORS.

Application filed June 29, 1920.- Serial No. 392,768.

(GRANTED UNDER THE PRQVISIONS OF THE ACT OF MARCHB, 1921, 41 STAT. In, 1313.)

To all whom it may concern:

Be it known that I, RICHARD WELLESLEY, a subject of the King of Great Britain, and a resident of Goodmayes, Essex, England, have invented certain new and useful Improvements in and Connected with the Production of Photographic Films in'Natural Colors (for which I have filed an application in Great Britain, February 18, 1919, No. 4053), of which the following is a specification.

This invention relates to the production of photographic films in natural color, and comprises. improvements in the method of producing films composed of a positive on which has been transferred a color medium from a supporting film, and also comprises improvements in the method of affixing color screens to positive films consisting in running the positive filmvand the color screen together over suitable guiding rolls through apparatus wherein an adhesive is applied to the inner side of one of the contacting surfaces which are then pressed together and subsequently cooled.

The accompanying figure of drawing is anelevation, partly in section, of an apparatus constructed and arranged in accordance wlth this inventlon.

In this drawing a is the positive film and a the color screen film and b and d are delivering reels for carrying the respective films. e is an adhesive receptacle heated by a suitable gas burner f, and provided with a feeding or delivery channel 9 having a controlling valve h and a discharging nozzle 9 adapted to extend over a considerable area of the film. '5 i and '5 are rollers of an adhesive applying apparatus, and j, 7' and j rollers of afilm compressing apparatus. 'la is a table having a top of any suitable translucent material under which is arranged a suitable number of electric lamps m so that by reason of the light passing through the films the adjusting operation to bring them into register will be facilitated. This table may be provided with pressing or guiding rollers n n 0 ,0 and o are the rollers of an additional film compressing apparatus. The cooling or adhesive solidify ing apparatus is shown at p, and comprises a suitably cooled slab or top 29 over which the compound film is adapted to pass under the rollers 17*, p and p. p is a guidingroller for delivering the compound film to the receiving reel 9, and r is'a motor forroits coated face'against one side of the color screen film delivered from the reel d to the rollers j, j and 7' of the compressing apparatus. The centres of these rollers are so arranged that the compound film passing through the apparatus Will be deflected from a straight line, and the tension due tothe passing of the compound film through the apparatus having rollers so arrangedfwill compress its layers together, thereby ensuring a uniform distribution of they adhe Isiive between the positivefilm and screen Thecom'pound film now passes over the translucent table is, and is here adjusted by hand in such a manner as to bring-the two films into the exact relative position necessary to give the maximum color efi'ect. After passing from this table the adjusted compound film passes through to the roller 0 0 and 0 of a second compressing apparatus, then passes over the slab or top p and under the rollers'p p and p of the cooling oradhesive solidifying a paratus p.

The united'films then pass over t e roller 52 on to the receiving reel q, and are then rea for the next stage of the process.

' The film or supporter of the color screen proper is separated from the compound film tween the color screen proper and the positive.

\Vhat I claim and desire to secure by Letters Patent is 1. A method of making color photographic films from a positive film and a color screen composed of a color medium mounted on a supporter, and to which the positive film is connected by an adhesive, consisting in feeding both films longitudinally together, heating the adhesive, applying the heated adhesive by gravity in the form of a thin uniform layer on the inner side oione of the films 'to be connected, pressing the cemented films together, adjusting the two films into register, pressing the adjusted films together, cooling the ce mentedand pressed films, and separating the color screen supporter from the color medium.

2. The method of making color photographic films in accordance with claim 1, consisting in cementing the color screen medium 'to its supporter by a soluble cement. and using an insoluble cement for cementing the color screen to the positive film, softening the soluble cement between the color screen medium and its supporter without.aifecting that between the medium and the positive film.

3. The method of making color photographic films in accordance with claim 1, consisting in cementing the color screen medium to its supporter by a soluble cement, and using an insoluble cement for cementing the color screen to the positive film, treating the combined films in a. bath of warm water acidified so as to soften the soluble cement between the color screen medium and its supporter without affecting that between the medium and the positive film.

4. The method of making color photographic films in accordance with claim '1, consisting in cementing the color screen medium to its supporter by a soluble cement, and using an insoluble cement for cementing the color screen to the positive film, treating the combined films in a bath of warm water acidified with acetic acid so as to soften the soluble cement between the color screen medium and its supporter without afiecting Ehat between the medium and the positive 5. Apparatus for producing color photographic films by securing a color screen composed of a color medium and a backing or supporting film to a positive film in such a manner that the backing or supporting film of the color screen medium can besubsequently removeddconsisting of guiding rollers for supporting the films, a gravity feed device adapted to discharge a layer of an insoluble adhesive on the contacting face of one ofthe two films. supporting means for holding the films to be cemented, a set of preliminary film'compressing rollers, an adjusting table having a translucent top .prnvided with means for illuminating it from its under side .so that the films can be brought into register thereon by hand, a secondary set of film compressing rollers, a cooling table, and means for drawing the films through the apparatus.

6. Apparatus in accordance wlth claim 5,

wherein the sets of compressing rollers each consist of three rollers arranged to engage the film at three points, the central one being arranged out of line with the other two and so that it will form a deflection in the path of the film, substantially as described.

In witness whereof I afiix my signature.

IRIHARD WELLESLEY. 

